The CAS Registry Mumber 112563-04-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,5,6 and 3 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 112563-04: (8*1)+(7*1)+(6*2)+(5*5)+(4*6)+(3*3)+(2*0)+(1*4)=89 89 % 10 = 9 So 112563-04-9 is a valid CAS Registry Number.